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JEE Main 2006
Exam
JEE Main
Year
2006
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2006 · Chemistry · Some Basic Concepts of Chemistry

How many moles of magnesium phosphate, Mg_3 (PO_4)_2 will contain...

How many moles of magnesium phosphate, Mg3\mathrm{Mg}_3\left(\mathrm{PO}_4\right)_2willcontainwill contain0.25 mole of oxygen atoms?

Options

  1. A0.020.02
  2. B3.125×10−23.125 \times 10^{-2}
  3. C1.25×10−21.25 \times 10^{-2}
  4. D2.5×10−22.5 \times 10^{-2}

Correct answer

B. 3.125×10−23.125 \times 10^{-2}

Step-by-step solution

\mathrm{Mg}_3(PO4)2\left(\mathrm{PO}_4\right)_2 'n' moles 8n=0.258 \mathrm{n}=0.25 n=0.258\mathrm{n}=\frac{0.25}{8} =258×100=3.125×10−2\quad=\frac{25}{8 \times 100}=3.125 \times 10^{-2}
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